Commit e61c5a0
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docs+seo: 首页 generateMetadata + 加新路由 boilerplate
补两条 i18n 收尾的零碎:
1. app/[locale]/page.tsx 加 generateMetadata
覆盖 root layout 默认 alternates,给首页输出当前 locale 的 canonical
(/zh 或 /en),并且 hreflang 三向声明(zh-CN / en-US / x-default)。
每个 locale 各自 canonical,不再共享 root 的 fallback。
2. dev_docs/i18n_url_routing.md 加「如何加新 user-facing 路由」章节
贴出 page.tsx + generateMetadata 的 boilerplate,列出 5 条容易踩的坑:
- setRequestLocale 排序
- @/i18n/navigation vs next/navigation 选错的后果
- components 不在 [locale] 下
- server fetch 让 page 退回 dynamic 的应对
- layout 嵌套也要逐层 setRequestLocale
后续加 page 直接抄就能保证 SSG + i18n 一起对。1 parent 8517332 commit e61c5a0
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